Stop bracket device in a loom for weaving



Feb. 9, 1960 A. KLAFKE 2,924,249

sToP BRACKET DEVICE 1N A Loom FOR wEAvING Filed oct. 7, 1957 'W/jjf/ d l/ INVENTOR. A LFO Ns /LA FKE.

A TTORNEK r' 2,924,249 Ice. Patented Feb. 9, 1960 STOP BRACKET DEVICE IN A LOOM FOR WEAVING Alfons 'Klafke,l Friedrichshafen, Germany, assigner to Lindauer Dornier G.m.b.H., Lindau im Bodensee, Germany, a tirm of Germany Application October 7, 1957, Serial No. 688,742

3 Claims. (Cl. 139-347) The present invention relates to a stop bracket device for looms for weaving, more particularly toa device mounted on the lay of the loom, the bracket being guided on a curved path and being provided with a feeler extending into the shuttle receiving box which is mounted on the lay, the feeler being engaged by the shuttles, when properly received in the box, and holding the bracket in its inactive position.

Stop bracket devices are used in looms for weaving to arrest forward movement of the lay and to stop the loom when a shuttle does arrive or does not arrive at the proper time in the shuttle receiving box so that the reed cannot complete the beat up stroke if a shuttle is in the shed formed by warp threads.

Conventional stop bracket devices usually have a curved tongue which is displaced by the shuttle arriving in the receiving box so that the tongue is lifted and can move above the member which is engaged by the tongue, if the latter is not lifted.

In high speed looms the rapidly repeated movement of the relatively heavy tongue is objectionable because the increased forces of inertia impede reliable operation of the stop bracket device.

By the provision of conventional curved guides for 4retaining the stop bracket in lifted position during the 4greater part of the movement of the lay undesired mass movement is considerably reduced.

In the device according to the invention a special feeler member is mounted on the stop bracket which member is engaged by the shuttle arriving in the shuttle receiving box at the correct time so that the bracket is retained in lifted position by the shuttle and no part of the stop bracket device moves as long as the loom operates correctly. Very little force is transmitted through the feeler element so that it can be made light and narrow, permitting enlargement of the surfaces which are engaged for stopping the lay and the loom.V

The feeler element is preferably in the form of a leaf spring or is resiliently connected with the stop bracket.

In the device according to the invention the curved guide for guiding the bracket and holding it in lifted position during the part of the stroke of the lay executed when the shuttle moves through the shed is preferably adjustably mounted on the loom frame so that the moment at which the bracket leaves the guide can be changed.

Dropping of the stop bracket into the active position,

Fig. 1 is a part sectional view of the stop bracket device according to the invention in the position in which it is when a shuttle'has been correctly received in the receiving box.

' Fig. 2 is a part sectional view of the device according to the invention in the position in which the device actuates the loom stop motion due to failure of arrival of a shuttle in the shuttle receiving box.

Fig. 3 shows a modified detail of the device according to Figs. 1 and 2.

Like parts are designated by like numerals in all figures of the drawing.

Referring more particularly to the drawing, numeral 1 designates a stop bracket which swings on a fulcrum 10 supported by the lay 3. The right arm of the bracket 1 carries a roller 2 adapted to roll on a guide 4 adjustably mounted on the loom frame by means of a stud 11 extending through a slot 12 in the guide member 4. During movement of the lay to the left (idle stroke) the roller 2 rolls on the guide 4, preventing dropping of the right arm of the bracket 1. During the lirst part of the movement of the lay to the right (beat up stroke) the roller also rolls on the guide 4. If a shuttle 5 has arrived at the proper time in the shuttle receiving box the bracket 1 is retained in lifted position by means of a feeler 6 which is mounted on the bracket and adapted to engage the shuttle. The bracket 1, therefore, cannot drop and engage a stop motion element 7 when the roller 2 leaves the guide 4.

If there is no shuttle at the proper time in the shuttle receiving box, the feeler 6 does not find any resistance and the right end of the bracket 1 drops into a notch on the element 7 rmly engaging the latter after the roller 2 has left the guide 4. In this case continued movement of the lay to the right causes actuation of the element 7. Dropping of the bracket is assisted by a spring 8 having one end connected with the lay and the other end connected with the left arm of the bracket 1.

ln the embodiments of the invention shown in Figs. l and 2 the feeler 6 is in the form of a leaf spring which yields easily if a shuttle arrives too late, i.e., when the bracket 1 has already swung in clockwise direction and engages the element 7.

The same result can be obtained with a rigid feeler which is yieldably connected with the bracket as is shown in Fig. 3. In this embodiment the rigid feeler 9 is held to the bracket 1 by a spring 13 interposed between the head of a stud 14, which is screwed into the bracket 1, and the feeler 9.

I claim:

1. ln a loom for weaving a loom frame, a curved guide mounted on the loom frame, a lay, a shuttle movable through a shed formed by warp threads, and a shuttle receiving box mounted on the lay; a stop bracket device including a stop bracket swingably mounted on the lay for swinging between an inactive and an active position, said bracket engaging and being held in the inactive position by said guide during the part of the stroke of the lay executed when a shuttle moves through .the shed, and a feeler attached to said bracket and extending into the shuttle box, said feeler being made of resilient material and abutting against a shuttle, if a shuttle is in the box, and holding said bracket in the inactive position and permitting said bracket to drop into the active position, when no shuttle is in the box.

2. In a loom for weaving as defined in claim l and wherein said feeler is in the'form of a leaf spring.

3. In a loom for weaving a loom frame, a curved guide mounted on the loom frame, a lay, a shuttle movable through a shed formed by warp threads, and a shuttle receiving box mounted on the lay; a stop bracket device includingyfai stop bracketswingably mount'eton'" the lay Referencescted inthele cfith'is'lpatcnt for swinging between aninactive and` anactiveposition, K Y i i said bracket engaging and being held in theinactive UNITED STATES PATENTS position by said guide during the part of the stroke of i bracket. in` theY inactive position, and` permitting said 7 FOREIGNPATENTS bracket to drop intothe active position, when no shuttle 10 is in the box, 360,433, Francei .....`1Feb.i.23,` 1906 

